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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ae9a92834f8feaac75be4d178915c7fea425e7cb309d8eb457a31326a18b2c' 
  AND token = 'KIVSj/cBm4QVVbINCijMzZn8/Nbj5WMjPkd3H0U1QqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}